Of the work that is useful, an increasing amount is being done by machines.
This will probably not only continue, and not only increase, but increase at an increasing rate.

Productivity cannot continue to increase, certainly not without modifications to its effects on ecosystems.

If productivity cannot increase at the current rate, and people are going to be doing a smaller percentage of the total work, large-scale employment is unsustainable.
Any profitable task that can be quantified will more and more likely be done by a machine.

The idea that work is inherently good is based upon antiquated thinking.